1mole of mgcl2 is dissolved in 1 l of water. which of the following is true?
a. mgcl2 exists at a concentration of 1m
b. mg2+ exists at a concentration of 1m
c. cl- exists at a concentration of 1m
d. none of the above
e. all of the above

There is a single path for electrons. the current decreases when additional resistors are added. the current will be the same in each resistor. these statements best describe a(n) circuit.

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Which of the following are good traits of a hypothesis? it will be able to be testedit can predict an outcomeit will explain the observationsall of these